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Diffstat (limited to 'fs/ext4/ext4.h')
-rw-r--r-- | fs/ext4/ext4.h | 1205 |
1 files changed, 1205 insertions, 0 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h new file mode 100644 index 000000000000..8158083f7ac0 --- /dev/null +++ b/fs/ext4/ext4.h | |||
@@ -0,0 +1,1205 @@ | |||
1 | /* | ||
2 | * ext4.h | ||
3 | * | ||
4 | * Copyright (C) 1992, 1993, 1994, 1995 | ||
5 | * Remy Card (card@masi.ibp.fr) | ||
6 | * Laboratoire MASI - Institut Blaise Pascal | ||
7 | * Universite Pierre et Marie Curie (Paris VI) | ||
8 | * | ||
9 | * from | ||
10 | * | ||
11 | * linux/include/linux/minix_fs.h | ||
12 | * | ||
13 | * Copyright (C) 1991, 1992 Linus Torvalds | ||
14 | */ | ||
15 | |||
16 | #ifndef _EXT4_H | ||
17 | #define _EXT4_H | ||
18 | |||
19 | #include <linux/types.h> | ||
20 | #include <linux/blkdev.h> | ||
21 | #include <linux/magic.h> | ||
22 | #include "ext4_i.h" | ||
23 | |||
24 | /* | ||
25 | * The second extended filesystem constants/structures | ||
26 | */ | ||
27 | |||
28 | /* | ||
29 | * Define EXT4FS_DEBUG to produce debug messages | ||
30 | */ | ||
31 | #undef EXT4FS_DEBUG | ||
32 | |||
33 | /* | ||
34 | * Define EXT4_RESERVATION to reserve data blocks for expanding files | ||
35 | */ | ||
36 | #define EXT4_DEFAULT_RESERVE_BLOCKS 8 | ||
37 | /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */ | ||
38 | #define EXT4_MAX_RESERVE_BLOCKS 1027 | ||
39 | #define EXT4_RESERVE_WINDOW_NOT_ALLOCATED 0 | ||
40 | |||
41 | /* | ||
42 | * Debug code | ||
43 | */ | ||
44 | #ifdef EXT4FS_DEBUG | ||
45 | #define ext4_debug(f, a...) \ | ||
46 | do { \ | ||
47 | printk (KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ | ||
48 | __FILE__, __LINE__, __FUNCTION__); \ | ||
49 | printk (KERN_DEBUG f, ## a); \ | ||
50 | } while (0) | ||
51 | #else | ||
52 | #define ext4_debug(f, a...) do {} while (0) | ||
53 | #endif | ||
54 | |||
55 | #define EXT4_MULTIBLOCK_ALLOCATOR 1 | ||
56 | |||
57 | /* prefer goal again. length */ | ||
58 | #define EXT4_MB_HINT_MERGE 1 | ||
59 | /* blocks already reserved */ | ||
60 | #define EXT4_MB_HINT_RESERVED 2 | ||
61 | /* metadata is being allocated */ | ||
62 | #define EXT4_MB_HINT_METADATA 4 | ||
63 | /* first blocks in the file */ | ||
64 | #define EXT4_MB_HINT_FIRST 8 | ||
65 | /* search for the best chunk */ | ||
66 | #define EXT4_MB_HINT_BEST 16 | ||
67 | /* data is being allocated */ | ||
68 | #define EXT4_MB_HINT_DATA 32 | ||
69 | /* don't preallocate (for tails) */ | ||
70 | #define EXT4_MB_HINT_NOPREALLOC 64 | ||
71 | /* allocate for locality group */ | ||
72 | #define EXT4_MB_HINT_GROUP_ALLOC 128 | ||
73 | /* allocate goal blocks or none */ | ||
74 | #define EXT4_MB_HINT_GOAL_ONLY 256 | ||
75 | /* goal is meaningful */ | ||
76 | #define EXT4_MB_HINT_TRY_GOAL 512 | ||
77 | |||
78 | struct ext4_allocation_request { | ||
79 | /* target inode for block we're allocating */ | ||
80 | struct inode *inode; | ||
81 | /* logical block in target inode */ | ||
82 | ext4_lblk_t logical; | ||
83 | /* phys. target (a hint) */ | ||
84 | ext4_fsblk_t goal; | ||
85 | /* the closest logical allocated block to the left */ | ||
86 | ext4_lblk_t lleft; | ||
87 | /* phys. block for ^^^ */ | ||
88 | ext4_fsblk_t pleft; | ||
89 | /* the closest logical allocated block to the right */ | ||
90 | ext4_lblk_t lright; | ||
91 | /* phys. block for ^^^ */ | ||
92 | ext4_fsblk_t pright; | ||
93 | /* how many blocks we want to allocate */ | ||
94 | unsigned long len; | ||
95 | /* flags. see above EXT4_MB_HINT_* */ | ||
96 | unsigned long flags; | ||
97 | }; | ||
98 | |||
99 | /* | ||
100 | * Special inodes numbers | ||
101 | */ | ||
102 | #define EXT4_BAD_INO 1 /* Bad blocks inode */ | ||
103 | #define EXT4_ROOT_INO 2 /* Root inode */ | ||
104 | #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ | ||
105 | #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ | ||
106 | #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ | ||
107 | #define EXT4_JOURNAL_INO 8 /* Journal inode */ | ||
108 | |||
109 | /* First non-reserved inode for old ext4 filesystems */ | ||
110 | #define EXT4_GOOD_OLD_FIRST_INO 11 | ||
111 | |||
112 | /* | ||
113 | * Maximal count of links to a file | ||
114 | */ | ||
115 | #define EXT4_LINK_MAX 65000 | ||
116 | |||
117 | /* | ||
118 | * Macro-instructions used to manage several block sizes | ||
119 | */ | ||
120 | #define EXT4_MIN_BLOCK_SIZE 1024 | ||
121 | #define EXT4_MAX_BLOCK_SIZE 65536 | ||
122 | #define EXT4_MIN_BLOCK_LOG_SIZE 10 | ||
123 | #ifdef __KERNEL__ | ||
124 | # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) | ||
125 | #else | ||
126 | # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) | ||
127 | #endif | ||
128 | #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof (__u32)) | ||
129 | #ifdef __KERNEL__ | ||
130 | # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) | ||
131 | #else | ||
132 | # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) | ||
133 | #endif | ||
134 | #ifdef __KERNEL__ | ||
135 | #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) | ||
136 | #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) | ||
137 | #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) | ||
138 | #else | ||
139 | #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ | ||
140 | EXT4_GOOD_OLD_INODE_SIZE : \ | ||
141 | (s)->s_inode_size) | ||
142 | #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ | ||
143 | EXT4_GOOD_OLD_FIRST_INO : \ | ||
144 | (s)->s_first_ino) | ||
145 | #endif | ||
146 | #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) | ||
147 | |||
148 | /* | ||
149 | * Structure of a blocks group descriptor | ||
150 | */ | ||
151 | struct ext4_group_desc | ||
152 | { | ||
153 | __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ | ||
154 | __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ | ||
155 | __le32 bg_inode_table_lo; /* Inodes table block */ | ||
156 | __le16 bg_free_blocks_count; /* Free blocks count */ | ||
157 | __le16 bg_free_inodes_count; /* Free inodes count */ | ||
158 | __le16 bg_used_dirs_count; /* Directories count */ | ||
159 | __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ | ||
160 | __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */ | ||
161 | __le16 bg_itable_unused; /* Unused inodes count */ | ||
162 | __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ | ||
163 | __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ | ||
164 | __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ | ||
165 | __le32 bg_inode_table_hi; /* Inodes table block MSB */ | ||
166 | __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ | ||
167 | __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ | ||
168 | __le16 bg_used_dirs_count_hi; /* Directories count MSB */ | ||
169 | __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ | ||
170 | __u32 bg_reserved2[3]; | ||
171 | }; | ||
172 | |||
173 | #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ | ||
174 | #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ | ||
175 | #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ | ||
176 | |||
177 | #ifdef __KERNEL__ | ||
178 | #include "ext4_sb.h" | ||
179 | #endif | ||
180 | /* | ||
181 | * Macro-instructions used to manage group descriptors | ||
182 | */ | ||
183 | #define EXT4_MIN_DESC_SIZE 32 | ||
184 | #define EXT4_MIN_DESC_SIZE_64BIT 64 | ||
185 | #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE | ||
186 | #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) | ||
187 | #ifdef __KERNEL__ | ||
188 | # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) | ||
189 | # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) | ||
190 | # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) | ||
191 | # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) | ||
192 | #else | ||
193 | # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) | ||
194 | # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) | ||
195 | # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) | ||
196 | #endif | ||
197 | |||
198 | /* | ||
199 | * Constants relative to the data blocks | ||
200 | */ | ||
201 | #define EXT4_NDIR_BLOCKS 12 | ||
202 | #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS | ||
203 | #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) | ||
204 | #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) | ||
205 | #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) | ||
206 | |||
207 | /* | ||
208 | * Inode flags | ||
209 | */ | ||
210 | #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ | ||
211 | #define EXT4_UNRM_FL 0x00000002 /* Undelete */ | ||
212 | #define EXT4_COMPR_FL 0x00000004 /* Compress file */ | ||
213 | #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ | ||
214 | #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ | ||
215 | #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ | ||
216 | #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ | ||
217 | #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ | ||
218 | /* Reserved for compression usage... */ | ||
219 | #define EXT4_DIRTY_FL 0x00000100 | ||
220 | #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ | ||
221 | #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ | ||
222 | #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */ | ||
223 | /* End compression flags --- maybe not all used */ | ||
224 | #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ | ||
225 | #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ | ||
226 | #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ | ||
227 | #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ | ||
228 | #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ | ||
229 | #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ | ||
230 | #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ | ||
231 | #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ | ||
232 | #define EXT4_EXT_MIGRATE 0x00100000 /* Inode is migrating */ | ||
233 | #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ | ||
234 | |||
235 | #define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */ | ||
236 | #define EXT4_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */ | ||
237 | |||
238 | /* | ||
239 | * Inode dynamic state flags | ||
240 | */ | ||
241 | #define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */ | ||
242 | #define EXT4_STATE_NEW 0x00000002 /* inode is newly created */ | ||
243 | #define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */ | ||
244 | #define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */ | ||
245 | |||
246 | /* Used to pass group descriptor data when online resize is done */ | ||
247 | struct ext4_new_group_input { | ||
248 | __u32 group; /* Group number for this data */ | ||
249 | __u64 block_bitmap; /* Absolute block number of block bitmap */ | ||
250 | __u64 inode_bitmap; /* Absolute block number of inode bitmap */ | ||
251 | __u64 inode_table; /* Absolute block number of inode table start */ | ||
252 | __u32 blocks_count; /* Total number of blocks in this group */ | ||
253 | __u16 reserved_blocks; /* Number of reserved blocks in this group */ | ||
254 | __u16 unused; | ||
255 | }; | ||
256 | |||
257 | /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ | ||
258 | struct ext4_new_group_data { | ||
259 | __u32 group; | ||
260 | __u64 block_bitmap; | ||
261 | __u64 inode_bitmap; | ||
262 | __u64 inode_table; | ||
263 | __u32 blocks_count; | ||
264 | __u16 reserved_blocks; | ||
265 | __u16 unused; | ||
266 | __u32 free_blocks_count; | ||
267 | }; | ||
268 | |||
269 | /* | ||
270 | * Following is used by preallocation code to tell get_blocks() that we | ||
271 | * want uninitialzed extents. | ||
272 | */ | ||
273 | #define EXT4_CREATE_UNINITIALIZED_EXT 2 | ||
274 | |||
275 | /* | ||
276 | * ioctl commands | ||
277 | */ | ||
278 | #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS | ||
279 | #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS | ||
280 | #define EXT4_IOC_GETVERSION _IOR('f', 3, long) | ||
281 | #define EXT4_IOC_SETVERSION _IOW('f', 4, long) | ||
282 | #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) | ||
283 | #define EXT4_IOC_GROUP_ADD _IOW('f', 8,struct ext4_new_group_input) | ||
284 | #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION | ||
285 | #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION | ||
286 | #ifdef CONFIG_JBD2_DEBUG | ||
287 | #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long) | ||
288 | #endif | ||
289 | #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) | ||
290 | #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) | ||
291 | #define EXT4_IOC_MIGRATE _IO('f', 7) | ||
292 | |||
293 | /* | ||
294 | * ioctl commands in 32 bit emulation | ||
295 | */ | ||
296 | #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS | ||
297 | #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS | ||
298 | #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) | ||
299 | #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) | ||
300 | #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) | ||
301 | #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) | ||
302 | #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) | ||
303 | #ifdef CONFIG_JBD2_DEBUG | ||
304 | #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int) | ||
305 | #endif | ||
306 | #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION | ||
307 | #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION | ||
308 | |||
309 | |||
310 | /* | ||
311 | * Mount options | ||
312 | */ | ||
313 | struct ext4_mount_options { | ||
314 | unsigned long s_mount_opt; | ||
315 | uid_t s_resuid; | ||
316 | gid_t s_resgid; | ||
317 | unsigned long s_commit_interval; | ||
318 | #ifdef CONFIG_QUOTA | ||
319 | int s_jquota_fmt; | ||
320 | char *s_qf_names[MAXQUOTAS]; | ||
321 | #endif | ||
322 | }; | ||
323 | |||
324 | /* | ||
325 | * Structure of an inode on the disk | ||
326 | */ | ||
327 | struct ext4_inode { | ||
328 | __le16 i_mode; /* File mode */ | ||
329 | __le16 i_uid; /* Low 16 bits of Owner Uid */ | ||
330 | __le32 i_size_lo; /* Size in bytes */ | ||
331 | __le32 i_atime; /* Access time */ | ||
332 | __le32 i_ctime; /* Inode Change time */ | ||
333 | __le32 i_mtime; /* Modification time */ | ||
334 | __le32 i_dtime; /* Deletion Time */ | ||
335 | __le16 i_gid; /* Low 16 bits of Group Id */ | ||
336 | __le16 i_links_count; /* Links count */ | ||
337 | __le32 i_blocks_lo; /* Blocks count */ | ||
338 | __le32 i_flags; /* File flags */ | ||
339 | union { | ||
340 | struct { | ||
341 | __le32 l_i_version; | ||
342 | } linux1; | ||
343 | struct { | ||
344 | __u32 h_i_translator; | ||
345 | } hurd1; | ||
346 | struct { | ||
347 | __u32 m_i_reserved1; | ||
348 | } masix1; | ||
349 | } osd1; /* OS dependent 1 */ | ||
350 | __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ | ||
351 | __le32 i_generation; /* File version (for NFS) */ | ||
352 | __le32 i_file_acl_lo; /* File ACL */ | ||
353 | __le32 i_size_high; | ||
354 | __le32 i_obso_faddr; /* Obsoleted fragment address */ | ||
355 | union { | ||
356 | struct { | ||
357 | __le16 l_i_blocks_high; /* were l_i_reserved1 */ | ||
358 | __le16 l_i_file_acl_high; | ||
359 | __le16 l_i_uid_high; /* these 2 fields */ | ||
360 | __le16 l_i_gid_high; /* were reserved2[0] */ | ||
361 | __u32 l_i_reserved2; | ||
362 | } linux2; | ||
363 | struct { | ||
364 | __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ | ||
365 | __u16 h_i_mode_high; | ||
366 | __u16 h_i_uid_high; | ||
367 | __u16 h_i_gid_high; | ||
368 | __u32 h_i_author; | ||
369 | } hurd2; | ||
370 | struct { | ||
371 | __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ | ||
372 | __le16 m_i_file_acl_high; | ||
373 | __u32 m_i_reserved2[2]; | ||
374 | } masix2; | ||
375 | } osd2; /* OS dependent 2 */ | ||
376 | __le16 i_extra_isize; | ||
377 | __le16 i_pad1; | ||
378 | __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ | ||
379 | __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ | ||
380 | __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ | ||
381 | __le32 i_crtime; /* File Creation time */ | ||
382 | __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ | ||
383 | __le32 i_version_hi; /* high 32 bits for 64-bit version */ | ||
384 | }; | ||
385 | |||
386 | |||
387 | #define EXT4_EPOCH_BITS 2 | ||
388 | #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) | ||
389 | #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) | ||
390 | |||
391 | /* | ||
392 | * Extended fields will fit into an inode if the filesystem was formatted | ||
393 | * with large inodes (-I 256 or larger) and there are not currently any EAs | ||
394 | * consuming all of the available space. For new inodes we always reserve | ||
395 | * enough space for the kernel's known extended fields, but for inodes | ||
396 | * created with an old kernel this might not have been the case. None of | ||
397 | * the extended inode fields is critical for correct filesystem operation. | ||
398 | * This macro checks if a certain field fits in the inode. Note that | ||
399 | * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize | ||
400 | */ | ||
401 | #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ | ||
402 | ((offsetof(typeof(*ext4_inode), field) + \ | ||
403 | sizeof((ext4_inode)->field)) \ | ||
404 | <= (EXT4_GOOD_OLD_INODE_SIZE + \ | ||
405 | (einode)->i_extra_isize)) \ | ||
406 | |||
407 | static inline __le32 ext4_encode_extra_time(struct timespec *time) | ||
408 | { | ||
409 | return cpu_to_le32((sizeof(time->tv_sec) > 4 ? | ||
410 | time->tv_sec >> 32 : 0) | | ||
411 | ((time->tv_nsec << 2) & EXT4_NSEC_MASK)); | ||
412 | } | ||
413 | |||
414 | static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) | ||
415 | { | ||
416 | if (sizeof(time->tv_sec) > 4) | ||
417 | time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) | ||
418 | << 32; | ||
419 | time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2; | ||
420 | } | ||
421 | |||
422 | #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ | ||
423 | do { \ | ||
424 | (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ | ||
425 | if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ | ||
426 | (raw_inode)->xtime ## _extra = \ | ||
427 | ext4_encode_extra_time(&(inode)->xtime); \ | ||
428 | } while (0) | ||
429 | |||
430 | #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ | ||
431 | do { \ | ||
432 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ | ||
433 | (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ | ||
434 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ | ||
435 | (raw_inode)->xtime ## _extra = \ | ||
436 | ext4_encode_extra_time(&(einode)->xtime); \ | ||
437 | } while (0) | ||
438 | |||
439 | #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ | ||
440 | do { \ | ||
441 | (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ | ||
442 | if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ | ||
443 | ext4_decode_extra_time(&(inode)->xtime, \ | ||
444 | raw_inode->xtime ## _extra); \ | ||
445 | } while (0) | ||
446 | |||
447 | #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ | ||
448 | do { \ | ||
449 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ | ||
450 | (einode)->xtime.tv_sec = \ | ||
451 | (signed)le32_to_cpu((raw_inode)->xtime); \ | ||
452 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ | ||
453 | ext4_decode_extra_time(&(einode)->xtime, \ | ||
454 | raw_inode->xtime ## _extra); \ | ||
455 | } while (0) | ||
456 | |||
457 | #define i_disk_version osd1.linux1.l_i_version | ||
458 | |||
459 | #if defined(__KERNEL__) || defined(__linux__) | ||
460 | #define i_reserved1 osd1.linux1.l_i_reserved1 | ||
461 | #define i_file_acl_high osd2.linux2.l_i_file_acl_high | ||
462 | #define i_blocks_high osd2.linux2.l_i_blocks_high | ||
463 | #define i_uid_low i_uid | ||
464 | #define i_gid_low i_gid | ||
465 | #define i_uid_high osd2.linux2.l_i_uid_high | ||
466 | #define i_gid_high osd2.linux2.l_i_gid_high | ||
467 | #define i_reserved2 osd2.linux2.l_i_reserved2 | ||
468 | |||
469 | #elif defined(__GNU__) | ||
470 | |||
471 | #define i_translator osd1.hurd1.h_i_translator | ||
472 | #define i_uid_high osd2.hurd2.h_i_uid_high | ||
473 | #define i_gid_high osd2.hurd2.h_i_gid_high | ||
474 | #define i_author osd2.hurd2.h_i_author | ||
475 | |||
476 | #elif defined(__masix__) | ||
477 | |||
478 | #define i_reserved1 osd1.masix1.m_i_reserved1 | ||
479 | #define i_file_acl_high osd2.masix2.m_i_file_acl_high | ||
480 | #define i_reserved2 osd2.masix2.m_i_reserved2 | ||
481 | |||
482 | #endif /* defined(__KERNEL__) || defined(__linux__) */ | ||
483 | |||
484 | /* | ||
485 | * File system states | ||
486 | */ | ||
487 | #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ | ||
488 | #define EXT4_ERROR_FS 0x0002 /* Errors detected */ | ||
489 | #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ | ||
490 | |||
491 | /* | ||
492 | * Misc. filesystem flags | ||
493 | */ | ||
494 | #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ | ||
495 | #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ | ||
496 | #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ | ||
497 | |||
498 | /* | ||
499 | * Mount flags | ||
500 | */ | ||
501 | #define EXT4_MOUNT_CHECK 0x00001 /* Do mount-time checks */ | ||
502 | #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */ | ||
503 | #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ | ||
504 | #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ | ||
505 | #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ | ||
506 | #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ | ||
507 | #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ | ||
508 | #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ | ||
509 | #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ | ||
510 | #define EXT4_MOUNT_ABORT 0x00200 /* Fatal error detected */ | ||
511 | #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ | ||
512 | #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ | ||
513 | #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ | ||
514 | #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ | ||
515 | #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ | ||
516 | #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ | ||
517 | #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ | ||
518 | #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ | ||
519 | #define EXT4_MOUNT_RESERVATION 0x10000 /* Preallocation */ | ||
520 | #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ | ||
521 | #define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */ | ||
522 | #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ | ||
523 | #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ | ||
524 | #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ | ||
525 | #define EXT4_MOUNT_EXTENTS 0x400000 /* Extents support */ | ||
526 | #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ | ||
527 | #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ | ||
528 | #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */ | ||
529 | #define EXT4_MOUNT_MBALLOC 0x4000000 /* Buddy allocation support */ | ||
530 | /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */ | ||
531 | #ifndef _LINUX_EXT2_FS_H | ||
532 | #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt | ||
533 | #define set_opt(o, opt) o |= EXT4_MOUNT_##opt | ||
534 | #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ | ||
535 | EXT4_MOUNT_##opt) | ||
536 | #else | ||
537 | #define EXT2_MOUNT_NOLOAD EXT4_MOUNT_NOLOAD | ||
538 | #define EXT2_MOUNT_ABORT EXT4_MOUNT_ABORT | ||
539 | #define EXT2_MOUNT_DATA_FLAGS EXT4_MOUNT_DATA_FLAGS | ||
540 | #endif | ||
541 | |||
542 | #define ext4_set_bit ext2_set_bit | ||
543 | #define ext4_set_bit_atomic ext2_set_bit_atomic | ||
544 | #define ext4_clear_bit ext2_clear_bit | ||
545 | #define ext4_clear_bit_atomic ext2_clear_bit_atomic | ||
546 | #define ext4_test_bit ext2_test_bit | ||
547 | #define ext4_find_first_zero_bit ext2_find_first_zero_bit | ||
548 | #define ext4_find_next_zero_bit ext2_find_next_zero_bit | ||
549 | #define ext4_find_next_bit ext2_find_next_bit | ||
550 | |||
551 | /* | ||
552 | * Maximal mount counts between two filesystem checks | ||
553 | */ | ||
554 | #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ | ||
555 | #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ | ||
556 | |||
557 | /* | ||
558 | * Behaviour when detecting errors | ||
559 | */ | ||
560 | #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ | ||
561 | #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ | ||
562 | #define EXT4_ERRORS_PANIC 3 /* Panic */ | ||
563 | #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE | ||
564 | |||
565 | /* | ||
566 | * Structure of the super block | ||
567 | */ | ||
568 | struct ext4_super_block { | ||
569 | /*00*/ __le32 s_inodes_count; /* Inodes count */ | ||
570 | __le32 s_blocks_count_lo; /* Blocks count */ | ||
571 | __le32 s_r_blocks_count_lo; /* Reserved blocks count */ | ||
572 | __le32 s_free_blocks_count_lo; /* Free blocks count */ | ||
573 | /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ | ||
574 | __le32 s_first_data_block; /* First Data Block */ | ||
575 | __le32 s_log_block_size; /* Block size */ | ||
576 | __le32 s_obso_log_frag_size; /* Obsoleted fragment size */ | ||
577 | /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ | ||
578 | __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */ | ||
579 | __le32 s_inodes_per_group; /* # Inodes per group */ | ||
580 | __le32 s_mtime; /* Mount time */ | ||
581 | /*30*/ __le32 s_wtime; /* Write time */ | ||
582 | __le16 s_mnt_count; /* Mount count */ | ||
583 | __le16 s_max_mnt_count; /* Maximal mount count */ | ||
584 | __le16 s_magic; /* Magic signature */ | ||
585 | __le16 s_state; /* File system state */ | ||
586 | __le16 s_errors; /* Behaviour when detecting errors */ | ||
587 | __le16 s_minor_rev_level; /* minor revision level */ | ||
588 | /*40*/ __le32 s_lastcheck; /* time of last check */ | ||
589 | __le32 s_checkinterval; /* max. time between checks */ | ||
590 | __le32 s_creator_os; /* OS */ | ||
591 | __le32 s_rev_level; /* Revision level */ | ||
592 | /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ | ||
593 | __le16 s_def_resgid; /* Default gid for reserved blocks */ | ||
594 | /* | ||
595 | * These fields are for EXT4_DYNAMIC_REV superblocks only. | ||
596 | * | ||
597 | * Note: the difference between the compatible feature set and | ||
598 | * the incompatible feature set is that if there is a bit set | ||
599 | * in the incompatible feature set that the kernel doesn't | ||
600 | * know about, it should refuse to mount the filesystem. | ||
601 | * | ||
602 | * e2fsck's requirements are more strict; if it doesn't know | ||
603 | * about a feature in either the compatible or incompatible | ||
604 | * feature set, it must abort and not try to meddle with | ||
605 | * things it doesn't understand... | ||
606 | */ | ||
607 | __le32 s_first_ino; /* First non-reserved inode */ | ||
608 | __le16 s_inode_size; /* size of inode structure */ | ||
609 | __le16 s_block_group_nr; /* block group # of this superblock */ | ||
610 | __le32 s_feature_compat; /* compatible feature set */ | ||
611 | /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ | ||
612 | __le32 s_feature_ro_compat; /* readonly-compatible feature set */ | ||
613 | /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ | ||
614 | /*78*/ char s_volume_name[16]; /* volume name */ | ||
615 | /*88*/ char s_last_mounted[64]; /* directory where last mounted */ | ||
616 | /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ | ||
617 | /* | ||
618 | * Performance hints. Directory preallocation should only | ||
619 | * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. | ||
620 | */ | ||
621 | __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ | ||
622 | __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ | ||
623 | __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ | ||
624 | /* | ||
625 | * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. | ||
626 | */ | ||
627 | /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ | ||
628 | /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ | ||
629 | __le32 s_journal_dev; /* device number of journal file */ | ||
630 | __le32 s_last_orphan; /* start of list of inodes to delete */ | ||
631 | __le32 s_hash_seed[4]; /* HTREE hash seed */ | ||
632 | __u8 s_def_hash_version; /* Default hash version to use */ | ||
633 | __u8 s_reserved_char_pad; | ||
634 | __le16 s_desc_size; /* size of group descriptor */ | ||
635 | /*100*/ __le32 s_default_mount_opts; | ||
636 | __le32 s_first_meta_bg; /* First metablock block group */ | ||
637 | __le32 s_mkfs_time; /* When the filesystem was created */ | ||
638 | __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ | ||
639 | /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ | ||
640 | /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ | ||
641 | __le32 s_r_blocks_count_hi; /* Reserved blocks count */ | ||
642 | __le32 s_free_blocks_count_hi; /* Free blocks count */ | ||
643 | __le16 s_min_extra_isize; /* All inodes have at least # bytes */ | ||
644 | __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ | ||
645 | __le32 s_flags; /* Miscellaneous flags */ | ||
646 | __le16 s_raid_stride; /* RAID stride */ | ||
647 | __le16 s_mmp_interval; /* # seconds to wait in MMP checking */ | ||
648 | __le64 s_mmp_block; /* Block for multi-mount protection */ | ||
649 | __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ | ||
650 | __u32 s_reserved[163]; /* Padding to the end of the block */ | ||
651 | }; | ||
652 | |||
653 | #ifdef __KERNEL__ | ||
654 | static inline struct ext4_sb_info * EXT4_SB(struct super_block *sb) | ||
655 | { | ||
656 | return sb->s_fs_info; | ||
657 | } | ||
658 | static inline struct ext4_inode_info *EXT4_I(struct inode *inode) | ||
659 | { | ||
660 | return container_of(inode, struct ext4_inode_info, vfs_inode); | ||
661 | } | ||
662 | |||
663 | static inline struct timespec ext4_current_time(struct inode *inode) | ||
664 | { | ||
665 | return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? | ||
666 | current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; | ||
667 | } | ||
668 | |||
669 | |||
670 | static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) | ||
671 | { | ||
672 | return ino == EXT4_ROOT_INO || | ||
673 | ino == EXT4_JOURNAL_INO || | ||
674 | ino == EXT4_RESIZE_INO || | ||
675 | (ino >= EXT4_FIRST_INO(sb) && | ||
676 | ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); | ||
677 | } | ||
678 | #else | ||
679 | /* Assume that user mode programs are passing in an ext4fs superblock, not | ||
680 | * a kernel struct super_block. This will allow us to call the feature-test | ||
681 | * macros from user land. */ | ||
682 | #define EXT4_SB(sb) (sb) | ||
683 | #endif | ||
684 | |||
685 | #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime | ||
686 | |||
687 | /* | ||
688 | * Codes for operating systems | ||
689 | */ | ||
690 | #define EXT4_OS_LINUX 0 | ||
691 | #define EXT4_OS_HURD 1 | ||
692 | #define EXT4_OS_MASIX 2 | ||
693 | #define EXT4_OS_FREEBSD 3 | ||
694 | #define EXT4_OS_LITES 4 | ||
695 | |||
696 | /* | ||
697 | * Revision levels | ||
698 | */ | ||
699 | #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ | ||
700 | #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ | ||
701 | |||
702 | #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV | ||
703 | #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV | ||
704 | |||
705 | #define EXT4_GOOD_OLD_INODE_SIZE 128 | ||
706 | |||
707 | /* | ||
708 | * Feature set definitions | ||
709 | */ | ||
710 | |||
711 | #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ | ||
712 | ( EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) ) | ||
713 | #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ | ||
714 | ( EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) ) | ||
715 | #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ | ||
716 | ( EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) ) | ||
717 | #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ | ||
718 | EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) | ||
719 | #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ | ||
720 | EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) | ||
721 | #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ | ||
722 | EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) | ||
723 | #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ | ||
724 | EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) | ||
725 | #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ | ||
726 | EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) | ||
727 | #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ | ||
728 | EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) | ||
729 | |||
730 | #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 | ||
731 | #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 | ||
732 | #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 | ||
733 | #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 | ||
734 | #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 | ||
735 | #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 | ||
736 | |||
737 | #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 | ||
738 | #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 | ||
739 | #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 | ||
740 | #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 | ||
741 | #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 | ||
742 | #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 | ||
743 | #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 | ||
744 | |||
745 | #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 | ||
746 | #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 | ||
747 | #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ | ||
748 | #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ | ||
749 | #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 | ||
750 | #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ | ||
751 | #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 | ||
752 | #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 | ||
753 | #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 | ||
754 | |||
755 | #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR | ||
756 | #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ | ||
757 | EXT4_FEATURE_INCOMPAT_RECOVER| \ | ||
758 | EXT4_FEATURE_INCOMPAT_META_BG| \ | ||
759 | EXT4_FEATURE_INCOMPAT_EXTENTS| \ | ||
760 | EXT4_FEATURE_INCOMPAT_64BIT| \ | ||
761 | EXT4_FEATURE_INCOMPAT_FLEX_BG) | ||
762 | #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ | ||
763 | EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ | ||
764 | EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ | ||
765 | EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ | ||
766 | EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ | ||
767 | EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ | ||
768 | EXT4_FEATURE_RO_COMPAT_HUGE_FILE) | ||
769 | |||
770 | /* | ||
771 | * Default values for user and/or group using reserved blocks | ||
772 | */ | ||
773 | #define EXT4_DEF_RESUID 0 | ||
774 | #define EXT4_DEF_RESGID 0 | ||
775 | |||
776 | /* | ||
777 | * Default mount options | ||
778 | */ | ||
779 | #define EXT4_DEFM_DEBUG 0x0001 | ||
780 | #define EXT4_DEFM_BSDGROUPS 0x0002 | ||
781 | #define EXT4_DEFM_XATTR_USER 0x0004 | ||
782 | #define EXT4_DEFM_ACL 0x0008 | ||
783 | #define EXT4_DEFM_UID16 0x0010 | ||
784 | #define EXT4_DEFM_JMODE 0x0060 | ||
785 | #define EXT4_DEFM_JMODE_DATA 0x0020 | ||
786 | #define EXT4_DEFM_JMODE_ORDERED 0x0040 | ||
787 | #define EXT4_DEFM_JMODE_WBACK 0x0060 | ||
788 | |||
789 | /* | ||
790 | * Structure of a directory entry | ||
791 | */ | ||
792 | #define EXT4_NAME_LEN 255 | ||
793 | |||
794 | struct ext4_dir_entry { | ||
795 | __le32 inode; /* Inode number */ | ||
796 | __le16 rec_len; /* Directory entry length */ | ||
797 | __le16 name_len; /* Name length */ | ||
798 | char name[EXT4_NAME_LEN]; /* File name */ | ||
799 | }; | ||
800 | |||
801 | /* | ||
802 | * The new version of the directory entry. Since EXT4 structures are | ||
803 | * stored in intel byte order, and the name_len field could never be | ||
804 | * bigger than 255 chars, it's safe to reclaim the extra byte for the | ||
805 | * file_type field. | ||
806 | */ | ||
807 | struct ext4_dir_entry_2 { | ||
808 | __le32 inode; /* Inode number */ | ||
809 | __le16 rec_len; /* Directory entry length */ | ||
810 | __u8 name_len; /* Name length */ | ||
811 | __u8 file_type; | ||
812 | char name[EXT4_NAME_LEN]; /* File name */ | ||
813 | }; | ||
814 | |||
815 | /* | ||
816 | * Ext4 directory file types. Only the low 3 bits are used. The | ||
817 | * other bits are reserved for now. | ||
818 | */ | ||
819 | #define EXT4_FT_UNKNOWN 0 | ||
820 | #define EXT4_FT_REG_FILE 1 | ||
821 | #define EXT4_FT_DIR 2 | ||
822 | #define EXT4_FT_CHRDEV 3 | ||
823 | #define EXT4_FT_BLKDEV 4 | ||
824 | #define EXT4_FT_FIFO 5 | ||
825 | #define EXT4_FT_SOCK 6 | ||
826 | #define EXT4_FT_SYMLINK 7 | ||
827 | |||
828 | #define EXT4_FT_MAX 8 | ||
829 | |||
830 | /* | ||
831 | * EXT4_DIR_PAD defines the directory entries boundaries | ||
832 | * | ||
833 | * NOTE: It must be a multiple of 4 | ||
834 | */ | ||
835 | #define EXT4_DIR_PAD 4 | ||
836 | #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) | ||
837 | #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ | ||
838 | ~EXT4_DIR_ROUND) | ||
839 | #define EXT4_MAX_REC_LEN ((1<<16)-1) | ||
840 | |||
841 | static inline unsigned ext4_rec_len_from_disk(__le16 dlen) | ||
842 | { | ||
843 | unsigned len = le16_to_cpu(dlen); | ||
844 | |||
845 | if (len == EXT4_MAX_REC_LEN) | ||
846 | return 1 << 16; | ||
847 | return len; | ||
848 | } | ||
849 | |||
850 | static inline __le16 ext4_rec_len_to_disk(unsigned len) | ||
851 | { | ||
852 | if (len == (1 << 16)) | ||
853 | return cpu_to_le16(EXT4_MAX_REC_LEN); | ||
854 | else if (len > (1 << 16)) | ||
855 | BUG(); | ||
856 | return cpu_to_le16(len); | ||
857 | } | ||
858 | |||
859 | /* | ||
860 | * Hash Tree Directory indexing | ||
861 | * (c) Daniel Phillips, 2001 | ||
862 | */ | ||
863 | |||
864 | #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ | ||
865 | EXT4_FEATURE_COMPAT_DIR_INDEX) && \ | ||
866 | (EXT4_I(dir)->i_flags & EXT4_INDEX_FL)) | ||
867 | #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) | ||
868 | #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) | ||
869 | |||
870 | /* Legal values for the dx_root hash_version field: */ | ||
871 | |||
872 | #define DX_HASH_LEGACY 0 | ||
873 | #define DX_HASH_HALF_MD4 1 | ||
874 | #define DX_HASH_TEA 2 | ||
875 | |||
876 | #ifdef __KERNEL__ | ||
877 | |||
878 | /* hash info structure used by the directory hash */ | ||
879 | struct dx_hash_info | ||
880 | { | ||
881 | u32 hash; | ||
882 | u32 minor_hash; | ||
883 | int hash_version; | ||
884 | u32 *seed; | ||
885 | }; | ||
886 | |||
887 | #define EXT4_HTREE_EOF 0x7fffffff | ||
888 | |||
889 | /* | ||
890 | * Control parameters used by ext4_htree_next_block | ||
891 | */ | ||
892 | #define HASH_NB_ALWAYS 1 | ||
893 | |||
894 | |||
895 | /* | ||
896 | * Describe an inode's exact location on disk and in memory | ||
897 | */ | ||
898 | struct ext4_iloc | ||
899 | { | ||
900 | struct buffer_head *bh; | ||
901 | unsigned long offset; | ||
902 | ext4_group_t block_group; | ||
903 | }; | ||
904 | |||
905 | static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) | ||
906 | { | ||
907 | return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); | ||
908 | } | ||
909 | |||
910 | /* | ||
911 | * This structure is stuffed into the struct file's private_data field | ||
912 | * for directories. It is where we put information so that we can do | ||
913 | * readdir operations in hash tree order. | ||
914 | */ | ||
915 | struct dir_private_info { | ||
916 | struct rb_root root; | ||
917 | struct rb_node *curr_node; | ||
918 | struct fname *extra_fname; | ||
919 | loff_t last_pos; | ||
920 | __u32 curr_hash; | ||
921 | __u32 curr_minor_hash; | ||
922 | __u32 next_hash; | ||
923 | }; | ||
924 | |||
925 | /* calculate the first block number of the group */ | ||
926 | static inline ext4_fsblk_t | ||
927 | ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) | ||
928 | { | ||
929 | return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + | ||
930 | le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); | ||
931 | } | ||
932 | |||
933 | /* | ||
934 | * Special error return code only used by dx_probe() and its callers. | ||
935 | */ | ||
936 | #define ERR_BAD_DX_DIR -75000 | ||
937 | |||
938 | void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr, | ||
939 | unsigned long *blockgrpp, ext4_grpblk_t *offsetp); | ||
940 | |||
941 | /* | ||
942 | * Function prototypes | ||
943 | */ | ||
944 | |||
945 | /* | ||
946 | * Ok, these declarations are also in <linux/kernel.h> but none of the | ||
947 | * ext4 source programs needs to include it so they are duplicated here. | ||
948 | */ | ||
949 | # define NORET_TYPE /**/ | ||
950 | # define ATTRIB_NORET __attribute__((noreturn)) | ||
951 | # define NORET_AND noreturn, | ||
952 | |||
953 | /* balloc.c */ | ||
954 | extern unsigned int ext4_block_group(struct super_block *sb, | ||
955 | ext4_fsblk_t blocknr); | ||
956 | extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, | ||
957 | ext4_fsblk_t blocknr); | ||
958 | extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); | ||
959 | extern unsigned long ext4_bg_num_gdb(struct super_block *sb, | ||
960 | ext4_group_t group); | ||
961 | extern ext4_fsblk_t ext4_new_block (handle_t *handle, struct inode *inode, | ||
962 | ext4_fsblk_t goal, int *errp); | ||
963 | extern ext4_fsblk_t ext4_new_blocks (handle_t *handle, struct inode *inode, | ||
964 | ext4_fsblk_t goal, unsigned long *count, int *errp); | ||
965 | extern ext4_fsblk_t ext4_new_blocks_old(handle_t *handle, struct inode *inode, | ||
966 | ext4_fsblk_t goal, unsigned long *count, int *errp); | ||
967 | extern void ext4_free_blocks (handle_t *handle, struct inode *inode, | ||
968 | ext4_fsblk_t block, unsigned long count, int metadata); | ||
969 | extern void ext4_free_blocks_sb (handle_t *handle, struct super_block *sb, | ||
970 | ext4_fsblk_t block, unsigned long count, | ||
971 | unsigned long *pdquot_freed_blocks); | ||
972 | extern ext4_fsblk_t ext4_count_free_blocks (struct super_block *); | ||
973 | extern void ext4_check_blocks_bitmap (struct super_block *); | ||
974 | extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, | ||
975 | ext4_group_t block_group, | ||
976 | struct buffer_head ** bh); | ||
977 | extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); | ||
978 | extern void ext4_init_block_alloc_info(struct inode *); | ||
979 | extern void ext4_rsv_window_add(struct super_block *sb, struct ext4_reserve_window_node *rsv); | ||
980 | |||
981 | /* dir.c */ | ||
982 | extern int ext4_check_dir_entry(const char *, struct inode *, | ||
983 | struct ext4_dir_entry_2 *, | ||
984 | struct buffer_head *, unsigned long); | ||
985 | extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, | ||
986 | __u32 minor_hash, | ||
987 | struct ext4_dir_entry_2 *dirent); | ||
988 | extern void ext4_htree_free_dir_info(struct dir_private_info *p); | ||
989 | |||
990 | /* fsync.c */ | ||
991 | extern int ext4_sync_file (struct file *, struct dentry *, int); | ||
992 | |||
993 | /* hash.c */ | ||
994 | extern int ext4fs_dirhash(const char *name, int len, struct | ||
995 | dx_hash_info *hinfo); | ||
996 | |||
997 | /* ialloc.c */ | ||
998 | extern struct inode * ext4_new_inode (handle_t *, struct inode *, int); | ||
999 | extern void ext4_free_inode (handle_t *, struct inode *); | ||
1000 | extern struct inode * ext4_orphan_get (struct super_block *, unsigned long); | ||
1001 | extern unsigned long ext4_count_free_inodes (struct super_block *); | ||
1002 | extern unsigned long ext4_count_dirs (struct super_block *); | ||
1003 | extern void ext4_check_inodes_bitmap (struct super_block *); | ||
1004 | extern unsigned long ext4_count_free (struct buffer_head *, unsigned); | ||
1005 | |||
1006 | /* mballoc.c */ | ||
1007 | extern long ext4_mb_stats; | ||
1008 | extern long ext4_mb_max_to_scan; | ||
1009 | extern int ext4_mb_init(struct super_block *, int); | ||
1010 | extern int ext4_mb_release(struct super_block *); | ||
1011 | extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, | ||
1012 | struct ext4_allocation_request *, int *); | ||
1013 | extern int ext4_mb_reserve_blocks(struct super_block *, int); | ||
1014 | extern void ext4_mb_discard_inode_preallocations(struct inode *); | ||
1015 | extern int __init init_ext4_mballoc(void); | ||
1016 | extern void exit_ext4_mballoc(void); | ||
1017 | extern void ext4_mb_free_blocks(handle_t *, struct inode *, | ||
1018 | unsigned long, unsigned long, int, unsigned long *); | ||
1019 | |||
1020 | |||
1021 | /* inode.c */ | ||
1022 | int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode, | ||
1023 | struct buffer_head *bh, ext4_fsblk_t blocknr); | ||
1024 | struct buffer_head *ext4_getblk(handle_t *, struct inode *, | ||
1025 | ext4_lblk_t, int, int *); | ||
1026 | struct buffer_head *ext4_bread(handle_t *, struct inode *, | ||
1027 | ext4_lblk_t, int, int *); | ||
1028 | int ext4_get_blocks_handle(handle_t *handle, struct inode *inode, | ||
1029 | ext4_lblk_t iblock, unsigned long maxblocks, | ||
1030 | struct buffer_head *bh_result, | ||
1031 | int create, int extend_disksize); | ||
1032 | |||
1033 | extern struct inode *ext4_iget(struct super_block *, unsigned long); | ||
1034 | extern int ext4_write_inode (struct inode *, int); | ||
1035 | extern int ext4_setattr (struct dentry *, struct iattr *); | ||
1036 | extern void ext4_delete_inode (struct inode *); | ||
1037 | extern int ext4_sync_inode (handle_t *, struct inode *); | ||
1038 | extern void ext4_discard_reservation (struct inode *); | ||
1039 | extern void ext4_dirty_inode(struct inode *); | ||
1040 | extern int ext4_change_inode_journal_flag(struct inode *, int); | ||
1041 | extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); | ||
1042 | extern void ext4_truncate (struct inode *); | ||
1043 | extern void ext4_set_inode_flags(struct inode *); | ||
1044 | extern void ext4_get_inode_flags(struct ext4_inode_info *); | ||
1045 | extern void ext4_set_aops(struct inode *inode); | ||
1046 | extern int ext4_writepage_trans_blocks(struct inode *); | ||
1047 | extern int ext4_block_truncate_page(handle_t *handle, struct page *page, | ||
1048 | struct address_space *mapping, loff_t from); | ||
1049 | |||
1050 | /* ioctl.c */ | ||
1051 | extern long ext4_ioctl(struct file *, unsigned int, unsigned long); | ||
1052 | extern long ext4_compat_ioctl (struct file *, unsigned int, unsigned long); | ||
1053 | |||
1054 | /* migrate.c */ | ||
1055 | extern int ext4_ext_migrate(struct inode *, struct file *, unsigned int, | ||
1056 | unsigned long); | ||
1057 | /* namei.c */ | ||
1058 | extern int ext4_orphan_add(handle_t *, struct inode *); | ||
1059 | extern int ext4_orphan_del(handle_t *, struct inode *); | ||
1060 | extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, | ||
1061 | __u32 start_minor_hash, __u32 *next_hash); | ||
1062 | |||
1063 | /* resize.c */ | ||
1064 | extern int ext4_group_add(struct super_block *sb, | ||
1065 | struct ext4_new_group_data *input); | ||
1066 | extern int ext4_group_extend(struct super_block *sb, | ||
1067 | struct ext4_super_block *es, | ||
1068 | ext4_fsblk_t n_blocks_count); | ||
1069 | |||
1070 | /* super.c */ | ||
1071 | extern void ext4_error (struct super_block *, const char *, const char *, ...) | ||
1072 | __attribute__ ((format (printf, 3, 4))); | ||
1073 | extern void __ext4_std_error (struct super_block *, const char *, int); | ||
1074 | extern void ext4_abort (struct super_block *, const char *, const char *, ...) | ||
1075 | __attribute__ ((format (printf, 3, 4))); | ||
1076 | extern void ext4_warning (struct super_block *, const char *, const char *, ...) | ||
1077 | __attribute__ ((format (printf, 3, 4))); | ||
1078 | extern void ext4_update_dynamic_rev (struct super_block *sb); | ||
1079 | extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, | ||
1080 | __u32 compat); | ||
1081 | extern int ext4_update_rocompat_feature(handle_t *handle, | ||
1082 | struct super_block *sb, __u32 rocompat); | ||
1083 | extern int ext4_update_incompat_feature(handle_t *handle, | ||
1084 | struct super_block *sb, __u32 incompat); | ||
1085 | extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, | ||
1086 | struct ext4_group_desc *bg); | ||
1087 | extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, | ||
1088 | struct ext4_group_desc *bg); | ||
1089 | extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, | ||
1090 | struct ext4_group_desc *bg); | ||
1091 | extern void ext4_block_bitmap_set(struct super_block *sb, | ||
1092 | struct ext4_group_desc *bg, ext4_fsblk_t blk); | ||
1093 | extern void ext4_inode_bitmap_set(struct super_block *sb, | ||
1094 | struct ext4_group_desc *bg, ext4_fsblk_t blk); | ||
1095 | extern void ext4_inode_table_set(struct super_block *sb, | ||
1096 | struct ext4_group_desc *bg, ext4_fsblk_t blk); | ||
1097 | |||
1098 | static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) | ||
1099 | { | ||
1100 | return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | | ||
1101 | le32_to_cpu(es->s_blocks_count_lo); | ||
1102 | } | ||
1103 | |||
1104 | static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) | ||
1105 | { | ||
1106 | return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | | ||
1107 | le32_to_cpu(es->s_r_blocks_count_lo); | ||
1108 | } | ||
1109 | |||
1110 | static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) | ||
1111 | { | ||
1112 | return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | | ||
1113 | le32_to_cpu(es->s_free_blocks_count_lo); | ||
1114 | } | ||
1115 | |||
1116 | static inline void ext4_blocks_count_set(struct ext4_super_block *es, | ||
1117 | ext4_fsblk_t blk) | ||
1118 | { | ||
1119 | es->s_blocks_count_lo = cpu_to_le32((u32)blk); | ||
1120 | es->s_blocks_count_hi = cpu_to_le32(blk >> 32); | ||
1121 | } | ||
1122 | |||
1123 | static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, | ||
1124 | ext4_fsblk_t blk) | ||
1125 | { | ||
1126 | es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); | ||
1127 | es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); | ||
1128 | } | ||
1129 | |||
1130 | static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, | ||
1131 | ext4_fsblk_t blk) | ||
1132 | { | ||
1133 | es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); | ||
1134 | es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); | ||
1135 | } | ||
1136 | |||
1137 | static inline loff_t ext4_isize(struct ext4_inode *raw_inode) | ||
1138 | { | ||
1139 | return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | | ||
1140 | le32_to_cpu(raw_inode->i_size_lo); | ||
1141 | } | ||
1142 | |||
1143 | static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) | ||
1144 | { | ||
1145 | raw_inode->i_size_lo = cpu_to_le32(i_size); | ||
1146 | raw_inode->i_size_high = cpu_to_le32(i_size >> 32); | ||
1147 | } | ||
1148 | |||
1149 | static inline | ||
1150 | struct ext4_group_info *ext4_get_group_info(struct super_block *sb, | ||
1151 | ext4_group_t group) | ||
1152 | { | ||
1153 | struct ext4_group_info ***grp_info; | ||
1154 | long indexv, indexh; | ||
1155 | grp_info = EXT4_SB(sb)->s_group_info; | ||
1156 | indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); | ||
1157 | indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); | ||
1158 | return grp_info[indexv][indexh]; | ||
1159 | } | ||
1160 | |||
1161 | |||
1162 | #define ext4_std_error(sb, errno) \ | ||
1163 | do { \ | ||
1164 | if ((errno)) \ | ||
1165 | __ext4_std_error((sb), __FUNCTION__, (errno)); \ | ||
1166 | } while (0) | ||
1167 | |||
1168 | /* | ||
1169 | * Inodes and files operations | ||
1170 | */ | ||
1171 | |||
1172 | /* dir.c */ | ||
1173 | extern const struct file_operations ext4_dir_operations; | ||
1174 | |||
1175 | /* file.c */ | ||
1176 | extern const struct inode_operations ext4_file_inode_operations; | ||
1177 | extern const struct file_operations ext4_file_operations; | ||
1178 | |||
1179 | /* namei.c */ | ||
1180 | extern const struct inode_operations ext4_dir_inode_operations; | ||
1181 | extern const struct inode_operations ext4_special_inode_operations; | ||
1182 | |||
1183 | /* symlink.c */ | ||
1184 | extern const struct inode_operations ext4_symlink_inode_operations; | ||
1185 | extern const struct inode_operations ext4_fast_symlink_inode_operations; | ||
1186 | |||
1187 | /* extents.c */ | ||
1188 | extern int ext4_ext_tree_init(handle_t *handle, struct inode *); | ||
1189 | extern int ext4_ext_writepage_trans_blocks(struct inode *, int); | ||
1190 | extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode, | ||
1191 | ext4_lblk_t iblock, | ||
1192 | unsigned long max_blocks, struct buffer_head *bh_result, | ||
1193 | int create, int extend_disksize); | ||
1194 | extern void ext4_ext_truncate(struct inode *, struct page *); | ||
1195 | extern void ext4_ext_init(struct super_block *); | ||
1196 | extern void ext4_ext_release(struct super_block *); | ||
1197 | extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset, | ||
1198 | loff_t len); | ||
1199 | extern int ext4_get_blocks_wrap(handle_t *handle, struct inode *inode, | ||
1200 | sector_t block, unsigned long max_blocks, | ||
1201 | struct buffer_head *bh, int create, | ||
1202 | int extend_disksize); | ||
1203 | #endif /* __KERNEL__ */ | ||
1204 | |||
1205 | #endif /* _EXT4_H */ | ||